Spider-Man was a 2002 video game released by Activision, based on the movie of the same name. This disc contains a special demo of the Spider-Man game, along with promotional material for the movie.
In April 2002, Kellogg's offered this CD-ROM for free in exchange for some UPCs of their cereals and 2 proof-of-purchases from gallon milk jugs, as part of a campaign with "America's Dairy Farmers and Milk Processors" (the creators of "Got Milk?".)
There are some differences between this Kellogg's Edition of the game and the original, including in-game billboard ads for The Kellogg Company and "Got Milk?". A full list of differences is available at GameFAQs.com.
Original press release for the Spiderman/Got Milk? campaign available at MrBreakfast.com.